Manley H Beam Rods
Mazda 1.8l BP
A customer had shipped to me a set of rods for his build.
Balancing the engine is being done.
This was a sealed box, I cut the seal.
I open the box, and I see this.
It already has my small end weights..
And the overall or big end weights noted on the box.
Also there is a spec sheet.
Along with tech info sheet and fastener torque specs.
First thing to do is number the rods.
A hammer and number stamp set is needed.
Place the rod in a rod vise to hold it stable and not mar it up.
Now to stamp the rod in to spots, one above the parting line and again below, with the same number.
Repeat for all rods. Since the boxes have info on them, I use a sharpie and number the box it came out of.
Now starting with the small end, or wrist pin end, I weigh all 4 rods in this set, and to check the factory recorded specs on the box.
#1 152.5 153.0
#2 152.8 152.7
#3 152.9 152.9
#4 152.9 153.0
So I have one rod (#3) that weighed the same as the factory spec, and two rods (#2 & #4) that were off by .1g
Number 1 rod is off by .5g by what the factory claimed, but over all the difference between high and low is .3g. Thatís good for out the box.
I am going to start with the heaviest small end and get it closer to 152.7g
I start with rod #1, 153.0g,
I know I do not to do more than buff it.
I scale it again, this has to be done quickly before the scale shuts off and I have to start all over.
I over shot my weight, The new belt cut quicker than I had expected. Small end is at 151.6g now.
I work the other 3 small ends and now have them at
Now with all the small ends with in a tight range, time to work the big end.
Some shops will weigh the big end like I have done the small end also. I go to an overall weight now.
The over all weights I start with are
These weights were taken after the small end has been done.
Target weight is Rod #1 of 534.0g
The rods were not too bad out of the box, with the small ends having a range of .4g and the big ends having a range of 1.4g
I would have thought Manley would have the big end weight a bit closer, 1g or less.